This version is not a full version of doom,
it only has 3 levels that were picked from the full version. It also refuses
to run after a certain date, but the archive here includes a utility to
get around that.

Cheats:TST - God ModeAMO - Gives full ammoNOC - No Clipping

Monsters:

Demon

Imp

Early version of Lost Soul

Cacodemon

Baron of Hell

Zombieman

Shotgun Guy (graphics are in there, but does not
appear in any of the levels)

The BFG and Plasma gun fire differently. The
Plasma gun emits green and red projectiles, while the BFG is more like
a super-fast plasma gun that spits tons of small projectiles.

This demo still has some of the bonus items
from the earlier alphas, and a few new unusual items.

The three levels which are included are mostly
done. There are still a few places that change in the final versions, such
as this winding green slime-filled corridor on E1M2 is replaced with a
nice walkway over the slime.

Another interesting thing to note from this
screen shot is that IT KEEPS SCORE!